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E-mail is one of the most important applications of TCP / IP. You do not use TCP / IP when you write mail. When you write mail, you use e-mail programs, such as Lotus Notes, Microsoft Corp. Outlook, or Netscape Communicator and so on.

TCP / IP is the Internet's communication protocol. The TCP / IP communication protocol is a description of the rules that computers must follow to comply with these rules before computers can communicate with each other.

All W3C standards (since 1996), including HTML, XHTML, and XML, define an internal character set called Unicode (ISO 10646). This character set is natively used by all modern web browsers. Most of the documents transmitted on the internet do not use this Unicode character set.

I got this following error “The SMTP server requires a secure connection or the client was not authenticated. The server response was:5.5.1 authentication Required” while attempting to send mail using asp.net c# (i.e Google authentication required).